Lamp base



FIG. 1 is a top-front-right perspective view of the lamp base showing our new design, with a harp shown in broken lines for purposes of illustration only and forming no part of the claimed design.

FIG. 2 is a front view of the design shown in FIG. 1;

FIG. 3 is a back view of the design shown in FIG. 1;

FIG. 4 is a right side view of the design shown in FIG. 1;

FIG. 5 is a left side view of the design shown in FIG. 1;

FIG. 6 is a top view of the design shown in FIG. 1;

FIG. 7 is a bottom view of the design shown in FIG. 1; and,

FIG. 8 is the same view as shown in FIG. 1 with a tiffany style lamp shade, shown in broken lines, which forms no part of the claimed design. 

The ornamental design for a lamp base, as shown and described. 